[xtensa-cvscommit] linux/arch/xtensa/kernel ptrace.c,1.3,1.4

[<sfo...@us...>]

Update of /cvsroot/xtensa/linux/arch/xtensa/kernel
In directory usw-pr-cvs1:/tmp/cvs-serv19701

Modified Files:
	ptrace.c 
Log Message:
Update algorithm to write AR registers via ptrace.

Do not return an error when reading/writing an AR register via ptrace that was not saved because it was not part of an active pane.  Return a value of 0 when reading.

Allow PC to be written via ptrace.


Index: ptrace.c
===================================================================
RCS file: /cvsroot/xtensa/linux/arch/xtensa/kernel/ptrace.c,v
retrieving revision 1.3
retrieving revision 1.4
diff -C2 -d -r1.3 -r1.4
*** ptrace.c	23 Sep 2002 19:20:20 -0000	1.3
--- ptrace.c	4 Oct 2002 06:30:55 -0000	1.4
***************
*** 162,167 ****
  			}
  			else {
! 				tmp = -1;
! 				res = -EIO;
  			}
  			break;
--- 162,171 ----
  			}
  			else {
! 			    /* If we are here, we are writing to an AR register
! 			     * that was not saved, because it was not part of
! 			     * an active window.  gdb sometimes save/restores
! 			     * all registers, so we behave as if it worked --
! 			     * return a value of 0 with no error.  */
! 			    tmp = 0;
  			}
  			break;
***************
*** 220,223 ****
--- 224,228 ----
  	case PTRACE_POKEUSR: {
  		struct pt_regs *regs;
+ 		unsigned long tmp;
  		res = 0;
  		regs = (struct pt_regs *)
***************
*** 239,250 ****
  			}
  			else if(a_reg >= first_pane*4) {
! 				if(first_pane < 0)
! 					res = -EIO;
! 				else
! 					child->thread.regfile[a_reg - first_pane*4] = data;
  			}
  			else {
! 				res = -EIO;
  			}
  			break;
  		case SYSCALL_NR:
--- 244,265 ----
  			}
  			else if(a_reg >= first_pane*4) {
! 			    if(first_pane < 0)
! 				res = -EIO;
! 			    else {
! 				tmp = XCHAL_NUM_AREGS / 4 - first_pane -
! 					(a_reg / 4 - first_pane) - 1;
! 				child->thread.regfile[tmp*4 + a_reg % 4] = data;
! 			    }
  			}
  			else {
! 			    /* If we are here, we are writing to an AR register
! 			     * that was not saved, because it was not part of
! 			     * an active window.  gdb sometimes save/restores
! 			     * all registers, so we behave as if it worked --
! 			     * return 0, but don't set any values.  */
  			}
+ 			break;
+ 		case REG_PC:
+ 			regs->pc = data;
  			break;
  		case SYSCALL_NR: